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ITEC851 Mobile Data Networks

tag 0 Download 11 Pages / 2,704 Words tag 16-07-2021


Q.1: The following packets are transmitted in a SCTP session. The marked packet is lost. What are the complete contents of the packet including the SACK chunk from Node 2? 
Q.2: A) is a table driven routing protocol suitable for high mobility scenarios? Justify your answer with reasons.

B) Consider the topology shown below. Simulate the DSR protocol to establish a path from node 1 to node 10. Find the paths found and the ratio of the number of Route Request packets sent out in the network. 

Q.3: A) the Ad Hoc network shown below (including node Q) is currently operating. The network is running the AODV routing protocol. Show the steps required to route a packet from node N to node I. In particular, what state is maintained at each node in the network?

B) What changes occur to the route, and how are these determined if node Q drops out of the network? 

Q.4: Consider the scenario wherein a mobile host (MH) is communicating with a fixed host (FH) through Mobility Support Router (MSR-1) using the Indirect TCP (I-TCP) protocol. The MSR sends to the MH the packets P1, P2, P3, P4 and P5 in that order. Packet P3 is dropped but packet P4 reaches the MH causing it to generate the first duplicate acknowledgement (DUPACK). Before this DUPACK packet arrives at the MSR it has already sent out packet P5. Write down the sequence of steps that will be performed by the MSR and MH to bring the system to a consistent state.

The MH now moves from MSR-1 to another cell (MSR-2). Detail the sequence of step required to move the connection to the new MSR. 

Q.5: A mobile network is built with a cluster size of 12. Draw an example cluster arrangement below centred on cell A. 
 Traffic in cell A increases such that the cell must be segmented using cell sectoring. It is decided to use 6 sectors in the cell. Draw the additional sectors and relabelled the cluster such that frequency reuse distances are not violated. 

Q. 6: A voice call was initiated in cell A. It is currently in progress in cell B, and is continuing to use the channels from cell A. The mobile host moves so that cell C is now the better base station. Cell C currently has no free channels. Describe in detail under what circumstances the call can continue in cell C, and when the call will be dropped. What reasonable steps could be performed to avoid dropping such calls in the future?
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